First off what device do you have? I posted this issues a few weeks ago about the ATT S4 and the WiFi hotspot does not work others are saying the Bluetooth still works but no one was been able to get the WiFi hotspot to work.

Can anyone confirm that FoxFi still works on the newest update? Thanks!

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I've seen quite a few reviews in the last couple days that the update has caused Foxfi to only work with USB and wifi fails. Check Playstore reviews on Foxfi and PDANET. I've delayed updating to 4.3 because of this and if I could figure out how to delete this download, I would. My last resort will be a factory reset but I'm not sure it'll erase the download.